A280758 Expansion of (1 + x + x^2)/(1 - x - 3*x^2 - x^3 + x^4).

1, 2, 6, 13, 32, 75, 178, 422, 999, 2368, 5609, 13290, 31486, 74597, 176736, 418723, 992042, 2350350, 5568463, 13192832, 31256529, 74053138, 175447094, 415670205, 984808096, 2333212667, 5527860066, 13096635958, 31028620727, 73513176000, 174167814073, 412639326842, 977627324334, 2316199942933

Offset

0,2

Links

Table of n, a(n) for n=0..33.

R. Sachdeva and A. K. Agarwal, Combinatorics of certain restricted n-color composition functions, Discrete Mathematics, 340, (2017), 361-372. See sequence C_6.

Index entries for linear recurrences with constant coefficients, signature (1, 3, 1, -1).

Crossrefs

Sequence in context: A062424 A258344 A099232 * A053562 A003039 A109385

Adjacent sequences: A280755 A280756 A280757 * A280759 A280760 A280761

Keyword

nonn,easy

Author

N. J. A. Sloane, Jan 16 2017

Status

approved